package com.cf.utils.interceptor;

import java.text.DateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Properties;
import java.util.regex.Matcher;

import org.apache.commons.collections.CollectionUtils;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Plugin;
import org.apache.ibatis.plugin.Signature;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.type.TypeHandlerRegistry;

/**
 * MyBatis拦截器打印不带问号的完整sql语句
 * 
 * @author gogym
 * @version 2018年8月13日
 * @see MybatisInterceptor
 * @since
 */
@Intercepts({
		@Signature(type = Executor.class, method = "update", args = {
				MappedStatement.class, Object.class }),
		@Signature(type = Executor.class, method = "query", args = {
				MappedStatement.class, Object.class, RowBounds.class,
				ResultHandler.class }) })

public class MybatisInterceptor implements Interceptor {
	@Override
	public Object intercept(Invocation invocation) throws Throwable {
		try {
			// 获取xml中的一个select/update/insert/delete节点，是一条SQL语句
			MappedStatement mappedStatement = (MappedStatement) invocation
					.getArgs()[0];
			Object parameter = null;
			// 获取参数，if语句成立，表示sql语句有参数，参数格式是map形式
			if (invocation.getArgs().length > 1) {
				parameter = invocation.getArgs()[1];
				System.out.println("parameter = " + parameter);
			}
			String sqlId = mappedStatement.getId(); // 获取到节点的id,即sql语句的id
			System.out.println("sqlId = " + sqlId);
			BoundSql boundSql = mappedStatement.getBoundSql(parameter); // BoundSql就是封装myBatis最终产生的sql类
			Configuration configuration = mappedStatement.getConfiguration(); // 获取节点的配置
			String sql = getSql(configuration, boundSql, sqlId); // 获取到最终的sql语句
			System.out.println("sql = " + sql);
		} catch (Exception e) {
			e.printStackTrace();
		}
		// 执行完上面的任务后，不改变原有的sql执行过程
		return invocation.proceed();
	}

	// 封装了一下sql语句，使得结果返回完整xml路径下的sql语句节点id + sql语句
	public static String getSql(Configuration configuration, BoundSql boundSql,
			String sqlId) {
		String sql = showSql(configuration, boundSql);
		StringBuilder str = new StringBuilder(100);
		str.append(sqlId);
		str.append(":");
		str.append(sql);
		return str.toString();
	}

	// 如果参数是String，则添加单引号， 如果是日期，则转换为时间格式器并加单引号； 对参数是null和不是null的情况作了处理
	private static String getParameterValue(Object obj) {
		String value = null;
		if (obj instanceof String) {
			value = "'" + obj.toString() + "'";
		} else if (obj instanceof Date) {
			DateFormat formatter = DateFormat.getDateTimeInstance(
					DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.CHINA);
			value = "'" + formatter.format(new Date()) + "'";
		} else {
			if (obj != null) {
				value = obj.toString();
			} else {
				value = "";
			}
		}
		return value;
	}

	// 进行？的替换
	public static String showSql(Configuration configuration,
			BoundSql boundSql) {
		// 获取参数
		Object parameterObject = boundSql.getParameterObject();
		List<ParameterMapping> parameterMappings = boundSql
				.getParameterMappings();
		// sql语句中多个空格都用一个空格代替
		String sql = boundSql.getSql().replaceAll("[\\s]+", " ");
		if (CollectionUtils.isNotEmpty(parameterMappings)
				&& parameterObject != null) {
			// 获取类型处理器注册器，类型处理器的功能是进行java类型和数据库类型的转换
			TypeHandlerRegistry typeHandlerRegistry = configuration
					.getTypeHandlerRegistry();
			// 如果根据parameterObject.getClass(）可以找到对应的类型，则替换
			if (typeHandlerRegistry
					.hasTypeHandler(parameterObject.getClass())) {
				sql = sql.replaceFirst("\\?", Matcher
						.quoteReplacement(getParameterValue(parameterObject)));
			} else {
				// MetaObject主要是封装了originalObject对象，提供了get和set的方法用于获取和设置originalObject的属性值,主要支持对JavaBean、Collection、Map三种类型对象的操作
				MetaObject metaObject = configuration
						.newMetaObject(parameterObject);
				for (ParameterMapping parameterMapping : parameterMappings) {
					String propertyName = parameterMapping.getProperty();
					if (metaObject.hasGetter(propertyName)) {
						Object obj = metaObject.getValue(propertyName);
						sql = sql.replaceFirst("\\?", Matcher
								.quoteReplacement(getParameterValue(obj)));
					} else if (boundSql.hasAdditionalParameter(propertyName)) {
						// 该分支是动态sql
						Object obj = boundSql
								.getAdditionalParameter(propertyName);
						sql = sql.replaceFirst("\\?", Matcher
								.quoteReplacement(getParameterValue(obj)));
					} else {
						// 打印出缺失，提醒该参数缺失并防止错位
						sql = sql.replaceFirst("\\?", "缺失");
					}
				}
			}
		}
		return sql;
	}

	@Override
	public Object plugin(Object target) {
		return Plugin.wrap(target, this);
	}

	@Override
	public void setProperties(Properties properties) {

	}
}
